I was wondering where this vacuum line goes on my 2000 Blazer 4x4 4.3 LS it is going back by the transmission and the line is leaking so I need to replace it

VIDEO OF LOCATION
https://imgur.com/a/hc5gvCN

 

If it goes behind the tranny that would be going to the transfer case up on top to the switch that allows vacuum to engage the front axel shaft when 4wd is activated. Pretty tight up on top of the transfer case, though. I couldn't get the link to work but that is the only place that a vacuum line would lead to. Unless it is the line going to the actuator under the battery from the switch on the transfer case.